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ICSE Class 10 Chemistry Question 15 of 23

Solved 2024 Specimen Paper ICSE Class 10 Chemistry — Question 4

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4
Question

Question 3(iv)

(a) State wether the following statements are TRUE or FALSE. Justify your answer.

  1. In an electrovalent compound, the cation attains the electronic configuration of the noble gas that comes after it in the periodic table.

  2. In the formation of a compound PQ2, atom P gives one electron to each atom of Q. The compound PQ2 is a good conductor of electricity.

(b) Calculate the number of moles in 22 grams of carbon dioxide.

Answer

(a)

  1. False
    In an electrovalent compound, the cation attains the electronic configuration of the noble gas that comes before it in the periodic table.
  2. True
    In the formation of a compound PQ2, atom P gives one electron to each atom of Q. The compound PQ2 is a good conductor of electricity in molten or aqueous solution state.

(b) Gram molecular mass of CO2 = 12 + 2(16)
= 12 + 32 = 44 g

As,

44 g of CO2 = 1 mole
∴ 22 g of CO2 = 144\dfrac{1}{44} x 22 = 0.5 moles

Hence, number of moles in 22 grams of carbon dioxide = 0.5